Do I have an STD?!?! Someone please help! 10 pts!?

A while ago, I performed on my boyfriend. Later on, I noticed something a little different. My tongue is sore like I had bitten it in my sleep and I have phlegm in the back of my throat (or it just feels that way). A while bac, my tongue had a burning sensation, but it was because of salt. So now I don't know what to think. I looked in the mirror and my tonsils look swollen. This hasn't really happened to me before. I don't know what could be wrong. Do I have an STD or something? Oh, the soreness of the tongue isn't constant. One day it can be sore and the next it can be fine. If anyone has any ideas or inputs, please help.